CN106587420A - System and method for removing heavy metals from wastewater - Google Patents
System and method for removing heavy metals from wastewater Download PDFInfo
- Publication number
- CN106587420A CN106587420A CN201611053832.5A CN201611053832A CN106587420A CN 106587420 A CN106587420 A CN 106587420A CN 201611053832 A CN201611053832 A CN 201611053832A CN 106587420 A CN106587420 A CN 106587420A
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- membrane
- heavy metal
- heavy metals
- hydroxide particles
- mwco membrane
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
A system and a method for removing heavy metals from wastewater are disclosed, the system comprises a reactor and a membrane separation tank which is connected with the reactor, the reactor is used for mixed reaction of wastewater containing the heavy metals and an alkali liquid for conversion of at least part of heavy metal ions into hydroxide particles; the membrane separation tank is internally provided with an interception membrane, the interception membrane is used for interception of the hydroxide particles in a liquid mixture after the mixed reaction, a suspended solid bed formed by the interception is collaborative with the interception membrane for further capture of the hydroxide particles and heavy metal ions which are not fully reacted, captured matters become one part of the suspended solid bed to participate the interception, and clear water passes through membrane pores of the interception membrane, and is pumped to a clear water tank by a membrane suction pump. The system a can effectively remove the heavy metal ions in the wastewater, and a small amount of sludge is produced.
Description
Technical field
The present invention relates to wastewater treatment, more particularly to a kind of system and method for removing heavy metals.
Background technology
Heavy metal ion is one of important pollutant in water environment, and which is essentially from mining, non-ferrous metal metallurgy
And the industry such as chemical industry, there is potentially hazardous property, be easily enriched with by biology, human body is entered by food chain, and in human body device
Gather in official, cause chronic poisoning.How effectively to administer heavy metal wastewater thereby pollution has become the problem that the mankind pay close attention to jointly.
At present, the method for traditional heavy metal containing wastewater treatment can substantially be divided three classes：1) weight in method of chemical treatment, i.e. waste water
By there is the method that chemical reaction is removed in metal ion；2) physical treatment process, makes the heavy metal ion in waste water not change
Carry out adsorbing under conditions of its chemical form, concentrate and detached method；3) biological treatment, by microorganism or the wadding of plant
The method that the effect such as solidifying, uptake and accumulation and enrichment removes heavy metal ions in wastewater.Wherein, domestic most of heavy metal is given up
Water treatment technology adopt chemical precipitation method, i.e., by adjust pH value after carry out coagulation-precipitation operation, by the heavy metal in water with
The mode of precipitate is separated, and the method is simple to operation, cheap, but have process not exclusively, high energy consumption, by original
Water water quality impact is big and produces the defects such as a large amount of toxic sludges, and effluent quality reaches 2 standard of table in GB21900-2008 reluctantly.
In recent years, the appearance of membrane technology changes the mode of traditional water process.Membrane separation technique is using a kind of special
Semipermeable membrane, in the presence of ambient pressure, does not change the chemical form of solute in solution, solvent and solute is separated or dense
The method of contracting.Divide according to membrane aperture, membrane technology can be divided into microfiltration, ultrafiltration, nanofiltration and reverse osmosiss.Wherein, nanofiltration and reverse osmosis
Ionic state material can be directly intercepted thoroughly, but operating pressure is larger, energy consumption is higher, has certain requirement to influent quality.It is super
The filter type as trapped particles state material is filtered, there are huge potentiality.If take the lead in by chemical method make heavy metal from from
Sub- state becomes granulating material, and its size is more than ultrafilter membrane fenestra, you can be removed by ultrafilter membrane, and filter pressure
It is much lower with respect to nanofiltration and reverse osmosiss.
Membrane technology is divided according to the property of material, then can be divided into organic membrane and inoranic membrane.Currently used ultrafilter membrane is big
Mostly organic membrane, its mechanical strength and chemical stability it is poor, service life is short.The appearance of inoranic membrane compensate for organic membrane this
Shortcoming.Ceramic membrane in inoranic membrane has high mechanical strength, good chemical stability, be resistant to extremely pollute environment and
Cleaning condition, the application in water process day by day increase.
The content of the invention
Present invention is primarily targeted at overcoming the deficiencies in the prior art, there is provided a kind of system of removal heavy metals and
Method.
For achieving the above object, the present invention is employed the following technical solutions：
A kind of system for removing heavy metals, including：
Reactor, for making the waste water containing heavy metal and alkali liquor carry out hybrid reaction, makes at least part of heavy metal ion
Change into hydroxide particles；
Membrance separation pond, connects the reactor, and mwco membrane is provided with the membrance separation pond, and the mwco membrane is for mixed
The hydroxide particles closed in reacted mixed liquor are retained, and retain suspended solid (SS) bed and the retention for being formed
Film collaboration further captures hydroxide particles and not sufficiently reactive heavy metal ion, and catches become the suspended solid
A part for bed and participate in retention；Clear water then by the fenestra of the mwco membrane, is pumped to filtered water tank by film suction pump.
Further：
The membrance separation pond includes the mud discharging portion of the lower section for being arranged on the mwco membrane, the suspended solid bed
Described in the unnecessary hydroxide particles Jing that suspended sediment concentration is produced after certain limit, mud discharging portion discharges.
The mud discharging portion includes taper bucket and mud discharging pipeline, and the unnecessary hydroxide particles are by gravity
Effect is fallen in the taper bucket and Jing mud dischargings pipeline is discharged.
Aerator is provided with the membrance separation pond, by Aeration fan Jing aerated conduits gas transmission to the aerator, aeration
Form stirring action to improve the suspended solid bed even concentration in the membrance separation pond, and the scouring on shape pair of films surface
Act on alleviating fouling membrane.
The fenestra pore diameter range of the mwco membrane is in 25～100nm.
The alkali liquor is NaOH alkali liquor or Ca (OH)2Alkali liquor.
The mwco membrane is nano ceramics film.
Blender is provided with the reactor, waste water is sufficiently mixed with alkali liquor for stirring.
A kind of method that system using described removal heavy metals removes heavy metals, including：
The waste water containing heavy metal is made to carry out hybrid reaction with alkali liquor by the reactor, in suitable pH environment
Under, make at least part of heavy metal ion change into hydroxide particles；
Mixed liquor containing hydroxide particles enters membrance separation pond, by the mwco membrane to the hydroxide in mixed liquor
Composition granule is retained, retain formed suspended solid bed and the mwco membrane collaboration further capture hydroxide particles with
And not sufficiently reactive heavy metal ion, catches become a part for the suspended solid bed and participate in retention；Clear water is then
By the fenestra of the mwco membrane, pumped to filtered water tank by film suction pump.
Further, accumulated in membrance separation pond using the hydroxide particles formed after reaction, by autoflocculation
Effect forms the high concentration suspended solid bed that concentration is 12000～18000mg/L, it is not necessary to dosing coagulant and flocculant.
Beneficial effects of the present invention：
Principle of the invention, adds alkali liquor and adjusts pH value of waste water, make heavy metal ion change into hydroxide particles,
Hydroxide particles and not sufficiently reactive heavy metal ion and nano ceramics film retention SS are captured using high concentration SS bed
The method of bed, can remove the heavy metal contaminants in waste water completely, each heavy metal concentration of process water outlet is stably reached
3 standard of table in GB21900-2008.
The present invention solves the problems with that prior art is not solved：
1. the problem big because adding flocculant and the caused sludge output of flocculation aid is eliminated；
2. Processing for removing effect is affected by change of water quality, and heavy metal contaminants are removed completely；
3. floor space, an investment cost and the operating cost of handling process are reduced；
4. the method easily realized in new construction and reconstruction project, easy to operate, easily realizes automatization, operation dimension
Shield is convenient.
Technical scheme has advantage in detail below：
1) sludge output is reduced, and recycling sludge is utilized.According to mass conservation law, the produced sludge of the present invention is only weight in water
The mixture of metal and added alkali liquor, without the medicinal liquids such as the flocculant in common process, flocculation aid that adulterate, sludge output is significantly
Amplitude is reduced, and heavy metal purity is high, can be used for recycling sludge recovery.
2) reduce floor space.When the present invention is implemented, it is only necessary to contact reactor, membrance separation pond and filtered water tank, relative to
Traditional handicraft, technological process shorten, and floor space is accordingly reduced.
3) it is easy to operate, easily realize automatization.It is pH value that the device uniquely needs the parameter for controlling, and the control of pH value exists
In Practical Project, controllability is higher.
4) high treating effect, is affected less by raw water quality.The handling principle of the device is：By adjusting suitable pH
Value, makes heavy metal ion change into hydroxide particles, although not sufficiently reactive heavy metal ion can be contained in water, these
Pollutant all can be captured by high concentration SS bed, fenestra of the grain diameter in SS beds more than nano ceramics film, using receiving
Rice ceramic membrane interception SS beds, you can reach the purpose for removing heavy metal contaminants.Consequently, it is possible to heavy metal ion is dense in raw water
The height of degree only influences whether the speed that the SS concentration of bed increases, and therefore its removal effect will not affect, so raw water water
The treatment effect of the technical method of verifying has little to no effect.
Description of the drawings
Fig. 1 is the structural representation of the system that an embodiment of the present invention removes heavy metals.
Fig. 2,3,4 respectively contrast traditional coagulation-depositing technology and new technology of the present invention to chromium in water (Cr), copper (Cu) and
The treatment effect of nickel (Ni) is illustrated.
Reference：
1- waste water conveyance conduits；2- reactors；3- blenders；4- alkali liquor conveyance conduits；5- mixed liquor conveyance conduits；6- films
Separate tank；7- mwco membranes；8- film water outlet suction channels；9- film suction pumps；10- film water outlet conveyance conduits；11- filtered water tanks；12- is clear
Water discharge spout road；13- aerators；14- aerated conduits；15- Aeration fans；16- mud discharging pipelines
Specific embodiment
Hereinafter embodiments of the present invention are elaborated.It is emphasized that what the description below was merely exemplary,
Rather than in order to limit the scope of the present invention and its application.
Refering to Fig. 1, in one embodiment, a kind of system for removing heavy metals, including reactor 2 and membrance separation pond
6.Reactor 2 is used to make the waste water containing heavy metal carry out hybrid reaction with alkali liquor, changes at least part of heavy metal ion
Hydroxide particles.Membrance separation pond 6 connects the reactor 2, is provided with mwco membrane 7, the mwco membrane in the membrance separation pond 6
7, for retaining to the hydroxide particles in the mixed liquor after hybrid reaction, retain suspended solid (SS) bed for being formed
Cooperate with the mwco membrane 7 and further capture hydroxide particles and not sufficiently reactive heavy metal ion, catches become
A part for the suspended solid bed and participate in retention；Clear water then by the fenestra of the mwco membrane 7, is taken out by film suction pump 9
Deliver to filtered water tank 11.
In a preferred embodiment, the membrance separation pond 6 includes the mud discharging of the lower section for being arranged on the mwco membrane 7
Portion, dirt described in the unnecessary hydroxide particles Jing that the suspended sediment concentration of the suspended solid bed is produced after exceeding certain limit
Mud discharge portion is discharged.
In a more preferred embodiment, the mud discharging portion includes taper bucket and mud discharging pipeline 16, described many
Remaining hydroxide particles fall in the taper bucket by action of gravity and Jing mud dischargings pipeline 16 is discharged.
In a preferred embodiment, aerator 13 is provided with the membrance separation pond 6, by 15 Jing aerated conduits of Aeration fan
14 gas transmissions form stirring action to improve the suspended solid bed concentration in the membrance separation pond 6 to the aerator 13, aeration
Uniformity, and the scrubbing action on shape pair of films surface is alleviating fouling membrane.
In a preferred embodiment, the fenestra pore diameter range of the mwco membrane 7 is in 25～100nm.
In a preferred embodiment, the mwco membrane 7 is nano ceramics film.
In a preferred embodiment, the alkali liquor is NaOH alkali liquor or Ca (OH)2Alkali liquor, more preferably NaOH alkali liquor.
In a preferred embodiment, blender 3 is provided with the reactor 2, make waste water abundant with alkali liquor for stirring
Mixing.
Refering to Fig. 1, in another kind of embodiment, a kind of system using described removal heavy metals removes waste water weight
The method of metal, including：
The waste water containing heavy metal is made to carry out hybrid reaction with alkali liquor by the reactor 2, in suitable pH environment
Under, make at least part of heavy metal ion change into hydroxide particles；
Mixed liquor containing hydroxide particles enters membrance separation pond 6, by the mwco membrane 7 to the hydrogen-oxygen in mixed liquor
Compound granule is retained, and is retained the suspended solid bed for being formed and is cooperateed with further capture hydroxide with the mwco membrane 7
Grain and not sufficiently reactive heavy metal ion, catches become a part for the suspended solid bed and participate in retention；Clearly
Water then by the fenestra of the mwco membrane 7, is pumped to filtered water tank by film suction pump.
In a preferred embodiment, accumulated in membrance separation pond 6 using the hydroxide particles formed after reaction, led to
Cross self-flocculation formed concentration be 12000～18000mg/L high concentration suspended solid bed, it is not necessary to dosing coagulant and
Flocculant.
According to the present invention, add alkali liquor and adjust pH value of waste water, make heavy metal ion change into hydroxide particles, using height
Concentration SS bed captures hydroxide particles and not sufficiently reactive heavy metal ion and nano ceramics film retains SS beds
Method, can remove the heavy metal contaminants in waste water completely, each heavy metal concentration of process water outlet is stably reached
3 standard of table in GB21900-2008.
The alkali liquor added when pH value is adjusted is generally NaOH (sodium hydroxide) or Ca (OH)2(calcium hydroxide), preferably
NaOH is adopted, this is because the dissolubility for adding NaOH medicines is larger, reaction is more abundant, and sludge output is little, in separative element
Bed SS concentration be readily obtained control.
The Forming Mechanism of SS beds is：Initial operating stage, by the use of the heavy metal ion in waste water as raw material, after adding alkali liquor
Convert it into hydroxide particles, and the stirring reaction in separative element, form SS beds, its SS concentration 12000～
In the range of 18000mg/L.
In running, if the SS concentration of bed is beyond set point, unnecessary hydroxide particles can divide
Gather in the taper bucket of unit bottom, when particle accumulation to a certain extent when, using action of gravity by these unnecessary hydrogen
Oxide particle is discharged, and maintains the SS concentration of bed with this.As alkali liquor has only been added in waste water, the processing method not only produces mud
Amount is few, and the heavy metal concentration in sludge is higher, and the purity of target heavy metal can be higher than 10%, meet the mark of heavy metal recovery
Discharge sludge can be carried out resource recycling by standard.
Nano ceramics film is installed in separative element, its pore diameter range control passes through in 25～100nm, now nano ceramics film
Retain high concentration SS bed to realize removing the purpose of heavy metal contaminants, clearance is close to 100%.
Aerator is set in nano ceramics film bottom, its effect there are two：On the one hand, aeration agitation can strengthen separation list
SS bed even concentrations in unit, are conducive to the capture of SS bed heavy metal pollutant；On the other hand, air bubble scrubbing film table
Fouling membrane can be alleviated in face, reduce the transmembrane pressure of film device, be conducive to prolonging service lifetime of film.
In a specific embodiment, as shown in figure 1, first, it is anti-that heavy metal wastewater thereby Jing waste water conveyance conduit 1 enters contact
Device 2 is answered, at the same time, alkali liquor Jing alkali liquor conveyance conduit 4 enters contact reactor 2, under the stirring action of blender 3, waste water
Be sufficiently mixed with alkali liquor, response time about 5min adjusts mixed liquor pH value to default pH value, make heavy metal in waste water from
Son is converted into hydroxide particles.
Membrance separation pond 6, the hydrogen in mixed liquor are entered from the blended liquid conveyance conduit 5 of the mixed liquor out of contact reactor 2
Oxide particle and not sufficiently reactive heavy metal ion are captured by the high concentration SS bed in pond.
Negative pressure is produced using film suction pump 9, SS beds are retained by nano ceramics membrane module 7, and clear water is from nano ceramics film group
The fenestra of part 7 enters film water outlet suction channel 8, and film water outlet Jing film water outlets conveyance conduit 10 is delivered to filtered water tank by film suction pump 9
11, film water outlet is stored using filtered water tank 11, and clear water is discharged by clear water discharge tube 12.
Compressed air is delivered to aerator 13 by aerated conduit 14 by Aeration fan 15, reaches the function of aeration, not only
The cake layer that film surface is formed is smashed, is mitigated fouling membrane, also SS beds is mixed, be conducive to raising bed to catch
Obtain the efficiency of heavy metal contaminants.
The bottom in membrance separation pond 6 is provided with taper bucket, when the SS concentration of bed exceeds certain limit, unnecessary granule meeting
Gather in bucket, sludge is discharged into membrance separation pond 6 via mud discharging pipeline 16 using action of gravity, it is ensured that the SS of bed is dense
Degree is in rational scope.
The technological operation of the present invention is easy, and processing unit is few, easily realizes automatization.
In experimentation, the technique of the present invention is compared with traditional coagulation-depositing technology, is obtained as shown in Figure 2,3, 4
Result.As can be seen that comparing traditional coagulation-depositing technology, either the superiority for the treatment of effect is steady with operation for the present invention
It is qualitative all quite outstanding.
Above content is with reference to concrete/preferred embodiment further description made for the present invention, it is impossible to recognized
Being embodied as of the fixed present invention is confined to these explanations.For general technical staff of the technical field of the invention,
Without departing from the inventive concept of the premise, which can also make some replacements or modification to the embodiment that these have described,
And these substitute or variant should all be considered as belonging to protection scope of the present invention.
Claims (10)
1. it is a kind of remove heavy metals system, it is characterised in that include：
Reactor, for making the waste water containing heavy metal and alkali liquor carry out hybrid reaction, makes at least part of heavy metal ion conversion
Hydrate granule；
Membrance separation pond, connects the reactor, and mwco membrane is provided with the membrance separation pond, and the mwco membrane is for anti-to mixing
Should after mixed liquor in hydroxide particles retained, retain formed suspended solid bed and the mwco membrane cooperate with into
One step captures hydroxide particles and not sufficiently reactive heavy metal ion, and catches become the one of the suspended solid bed
Retention is participated in partly；Clear water then by the fenestra of the mwco membrane, is pumped to filtered water tank by film suction pump.
2. the system for removing heavy metals as claimed in claim 1, it is characterised in that the membrance separation pond includes being arranged on
The mud discharging portion of the lower section of the mwco membrane, the suspended sediment concentration of the suspended solid bed are produced after certain limit
Unnecessary hydroxide particles Jing described in mud discharging portion discharge.
3. the system for removing heavy metals as claimed in claim 2, it is characterised in that the mud discharging portion includes taper
Bucket and mud discharging pipeline, the unnecessary hydroxide particles are fallen in the taper bucket by action of gravity and Jing sludge
Discharge tube is discharged.
4. as described in any one of claims 1 to 3 removal heavy metals system, it is characterised in that the membrance separation pond
Aerator is provided with inside, by Aeration fan Jing aerated conduits gas transmission to the aerator, aeration forms stirring action to improve
State the suspended solid bed even concentration in membrance separation pond, and the scrubbing action on shape pair of films surface to alleviate fouling membrane.
5. as described in any one of Claims 1-4 removal heavy metals system, it is characterised in that the mwco membrane
Fenestra pore diameter range is in 25～100nm.
6. the system of the removal heavy metals as described in any one of claim 1 to 5, it is characterised in that the alkali liquor is
NaOH alkali liquor or Ca (OH)2Alkali liquor.
7. the system of the removal heavy metals as described in any one of claim 1 to 6, it is characterised in that the mwco membrane is
Nano ceramics film.
8. as described in any one of claim 1 to 7 removal heavy metals system, it is characterised in that in the reactor
Blender is provided with, waste water is sufficiently mixed with alkali liquor for stirring.
9. a kind of system of removal heavy metals of use as described in any one of claim 1 to 8 removes heavy metals
Method, it is characterised in that include：
Make the waste water containing heavy metal hybrid reaction be carried out with alkali liquor by the reactor, under suitable pH environment, make
At least partly heavy metal ion changes into hydroxide particles；
Mixed liquor containing hydroxide particles enters membrance separation pond, by the mwco membrane to the hydroxide in mixed liquor
Grain is retained, and retains the suspended solid bed that formed and mwco membrane collaboration further captures hydroxide particles and not
The heavy metal ion fully reacted, catches become a part for the suspended solid bed and participate in retention；Clear water then passes through
The fenestra of the mwco membrane, is pumped to filtered water tank by film suction pump.
10. process for treating heavy-metal waste water as claimed in claim 9, it is characterised in that using the hydroxide formed after reaction
Composition granule is accumulated in membrance separation pond, forms the high-density suspended that concentration is 12000～18000mg/L by self-flocculation
Floating solid bed, it is not necessary to dosing coagulant and flocculant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611053832.5A CN106587420A (en) | 2016-11-22 | 2016-11-22 | System and method for removing heavy metals from wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611053832.5A CN106587420A (en) | 2016-11-22 | 2016-11-22 | System and method for removing heavy metals from wastewater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106587420A true CN106587420A (en) | 2017-04-26 |
Family
ID=58591919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611053832.5A Pending CN106587420A (en) | 2016-11-22 | 2016-11-22 | System and method for removing heavy metals from wastewater |
Country Status (1)
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| CN (1) | CN106587420A (en) |
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| CN110975647A (en) * | 2019-11-26 | 2020-04-10 | 西安建筑科技大学 | Preparation method and application of ZnO/CuO semiconductor composite inorganic film |
| CN115353259A (en) * | 2022-09-13 | 2022-11-18 | 北京林业大学 | Gravity-driven rainwater purification device based on coagulation in-situ construction of filter cake and operation method |
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| CN110975647A (en) * | 2019-11-26 | 2020-04-10 | 西安建筑科技大学 | Preparation method and application of ZnO/CuO semiconductor composite inorganic film |
| CN110975647B (en) * | 2019-11-26 | 2021-11-23 | 西安建筑科技大学 | Preparation method and application of ZnO/CuO semiconductor composite inorganic film |
| CN115353259A (en) * | 2022-09-13 | 2022-11-18 | 北京林业大学 | Gravity-driven rainwater purification device based on coagulation in-situ construction of filter cake and operation method |
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Application publication date: 20170426 |
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